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Disruption of brain chemokine networks and impaired neural circuit formation due to developmental exposure to chemicals

Research Project

Project/Area Number 20H04341
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 63030:Chemical substance influence on environment-related
Research InstitutionHiroshima University

Principal Investigator

Ishihara Yasuhiro  広島大学, 統合生命科学研究科(総), 教授 (80435073)

Co-Investigator(Kenkyū-buntansha) 大島 隆幸  徳島文理大学, 理工学部, 准教授 (10397557)
冨永 貴志  徳島文理大学, 神経科学研究所, 教授 (20344046)
大黒 亜美  広島大学, 医系科学研究科(薬), 特定准教授 (20634497)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2023: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2022: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2021: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Keywords発達神経毒性 / 神経回路機能 / ミクログリア / ケモカイン / 化学物質 / 神経炎症
Outline of Research at the Start

医療や産業に使われている化学物質の中には、バルプロ酸やポリ塩化ビフェニルなど、胎児期や乳幼児期の曝露により、成長後の行動異常を引き起こすものが幾らかある。一方、脳内には免疫を担当するミクログリアと呼ばれる細胞が存在し、常に脳内を監視して異物を排除している。本研究では、化学物質の発達期の脳への作用メカニズムについて、ミクログリアに着目して検討する。ミクログリアが過剰に活性化すると、障害作用を有する炎症性分子を放出することから、まずは化学物質と炎症との関連を解析する。

Outline of Final Research Achievements

We aimed to elucidate the mechanism underlying developmental neurotoxicity induced by exposure to chemicals during development, with a focus on microglia, immune cells in the brain, and chemokines produced by microglia. Exposure to the antiepileptic drug valproic acid (VPA) during development resulted in microglial activation in the hippocampal CA1 region, accompanied by excitatory shifts in neural circuit function and subsequent behavioral abnormalities. We identified the chemokine CCL3, whose expression is upregulated by VPA. The CCR5 (a CCL3 receptor) antagonist maraviroc suppressed neural circuit dysfunction and behavioral abnormalities. Therefore, our findings suggest that CCL3 released by activated microglia can contribute to developmental neurotoxicity induced by VPA.

Academic Significance and Societal Importance of the Research Achievements

現在、10万種類にもおよぶ化学物質が工業的に生産されているが、化学物質による神経影響も危惧されており、米国小児科学会や欧州食品安全機関が医薬品や農薬の脳の発達への影響を警告している。化学物質のリスク評価を適正に行うためには、作用メカニズムの解明が望まれる。本研究では、ミクログリア由来CCL3という発達神経毒性に関与し得る具体的な分子の同定に成功した。本研究は、ケモカインネットワークと発達神経毒性との関連を示す点で創造的であり、バイオマーカーとしての利用や受容体アンタゴニストの投与など、発達神経毒性の早期発見・予防戦略も提供する。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (19 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (3 results) Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 6 results,  Open Access: 6 results) Presentation (6 results) (of which Int'l Joint Research: 1 results,  Invited: 3 results) Remarks (3 results)

  • [Int'l Joint Research] カリフォルニア大学デービス校(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] University of California, Davis(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] カリフォルニア大学デービス校(米国)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Microglial inflammatory reactions regulated by oxidative stress2023

    • Author(s)
      Ishihara Yasuhiro、Itoh Kouichi
    • Journal Title

      Journal of Clinical Biochemistry and Nutrition

      Volume: 72 Issue: 1 Pages: 23-27

    • DOI

      10.3164/jcbn.22-71

    • ISSN
      0912-0009, 1880-5086
    • Related Report
      2023 Annual Research Report 2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A CCR5 antagonist, maraviroc, alleviates neural circuit dysfunction and behavioral disorders induced by prenatal valproate exposure2022

    • Author(s)
      Yasuhiro Ishihara, Tatsuya Honda, Nami Ishihara, Kaede Namba, Makiko Taketoshi, Yoko Tominaga, Mayumi Tsuji, Christoph F. A. Vogel, Takeshi Yamazaki, Kouichi Itoh & Takashi Tominaga
    • Journal Title

      JOURNAL OF NEUROINFLAMMATION

      Volume: 19 Issue: 1 Pages: 195-195

    • DOI

      10.1186/s12974-022-02559-y

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Aryl Hydrocarbon Receptor Signaling Synergizes with TLR/NF-κB-Signaling for Induction of IL-22 Through Canonical and Non-Canonical AhR Pathways2022

    • Author(s)
      Ishihara Yasuhiro、Kado Sarah Y.、Bein Keith J.、He Yi、Pouraryan Arshia A.、Urban Angelika、Haarmann-Stemmann Thomas、Sweeney Colleen、Vogel Christoph F. A.
    • Journal Title

      Frontiers in Toxicology

      Volume: 3 Pages: 787360-787360

    • DOI

      10.3389/ftox.2021.787360

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] FosL1 Is a Novel Target of Levetiracetam for Suppressing the Microglial Inflammatory Reaction2021

    • Author(s)
      Niidome Kouji、Taniguchi Ruri、Yamazaki Takeshi、Tsuji Mayumi、Itoh Kouichi、Ishihara Yasuhiro
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 22 Issue: 20 Pages: 10962-10962

    • DOI

      10.3390/ijms222010962

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Involvement of the Microglial Aryl Hydrocarbon Receptor in Neuroinflammation and Vasogenic Edema after Ischemic Stroke2021

    • Author(s)
      Tanaka Miki、Fujikawa Masaho、Oguro Ami、Itoh Kouichi、Vogel Christoph F. A.、Ishihara Yasuhiro
    • Journal Title

      Cells

      Volume: 10 Issue: 4 Pages: 718-718

    • DOI

      10.3390/cells10040718

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Targeting the Aryl Hydrocarbon Receptor Signaling Pathway in Breast Cancer Development2021

    • Author(s)
      Vogel Christoph F. A.、Lazennec Gwendal、Kado Sarah Y.、Dahlem Carla、He Yi、Castaneda Alejandro、Ishihara Yasuhiro、Vogeley Christian、Rossi Andrea、Haarmann-Stemmann Thomas、Jugan Juliann、Mori Hidetoshi、Borowsky Alexander D.、La Merrill Michele A.、Sweeney Colleen
    • Journal Title

      Frontiers in Immunology

      Volume: 12 Pages: 625346-625346

    • DOI

      10.3389/fimmu.2021.625346

    • Related Report
      2021 Annual Research Report
  • [Journal Article] DHA and Its Metabolites Have a Protective Role against Methylmercury-Induced Neurotoxicity in Mouse Primary Neuron and SH-SY5Y Cells2021

    • Author(s)
      Oguro Ami、Fujita Kenta、Ishihara Yasuhiro、Yamamoto Megumi、Yamazaki Takeshi
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 22 Issue: 6 Pages: 3213-3213

    • DOI

      10.3390/ijms22063213

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 発達期化学物質曝露によるミクログリア活性化と異常神経回路網の形成2023

    • Author(s)
      石原 康宏
    • Organizer
      第50回日本毒性学会学術年会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 酸化ストレスによるミクログリア炎症反応の制御2022

    • Author(s)
      石原 康宏
    • Organizer
      第75日本酸化ストレス学会学術集会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] ネオニコチノイド発達期曝露は発達期ミクログリアの急激な増殖を抑制し、 興奮‐抑制バランスを興奮側にシフトする2022

    • Author(s)
      難波楓、富永貴志、石原康宏
    • Organizer
      第142回 日本薬理学会近畿部会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 化学物質曝露によるミクログリア活性化と異常神経回路網の形成2021

    • Author(s)
      石原 康宏
    • Organizer
      第94 回日本生化学会大会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Activation of microglia and excitation-inhibition imbalances in the developing hippocampus of mice prenatally treated with valproate.2020

    • Author(s)
      Ishihara Y, Itoh K, Tominaga T.
    • Organizer
      GLIA IN HEALTH & DISEASE Cold Spring Harbor Laboratory Meetings & Courses
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ネオニコチノイド胎児期曝露による成長後の行動異常.2020

    • Author(s)
      難波 楓、本田 達也、石原 康宏.
    • Organizer
      第61回生化学会中国四国支部例会
    • Related Report
      2020 Annual Research Report
  • [Remarks] 広島大学 生体機能化学研究室

    • URL

      https://www.biomed.hiroshima-u.ac.jp/ishihara/index.html

    • Related Report
      2023 Annual Research Report
  • [Remarks] 広島大学 大学院統合生命科学研究科 生命医科学プログラム 生体機能化学研究室

    • URL

      https://www.biomed.hiroshima-u.ac.jp/ishihara/

    • Related Report
      2022 Annual Research Report 2020 Annual Research Report
  • [Remarks] 広島大学 大学院統合生命科学研究科 生命医科学プログラム 生体機能化学研究室

    • URL

      https://www.biomed.hiroshima-u.ac.jp/ishihara/index.html

    • Related Report
      2021 Annual Research Report

URL: 

Published: 2020-04-28   Modified: 2025-01-30  

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